Printable Hard Sudoku

Set 12yv65p. 8 puzzles with an answer key, ready to print.

Hard puzzles start with about 29 givens and need real techniques: pointing pairs, naked pairs and hidden pairs. Paper is a great way to practice them, because you have to keep your own notes honest.

Each free PDF has 8 puzzles, four to a page on US Letter paper, plus an answer key with every solution. Every puzzle has exactly one solution. A new set appears here every day, or you can grab a different set any time.

Puzzles in this set

Hard #1
4 7
1 2 6 8 4
8 5 4 1
8 6
7 1 5
1 5 3 2
2 8
6 9 2
4 8 6 3
Hard #2
8 3 9
2 6 7
1 7 4 9
6 9
1 5 4 7
3 9 2 8 1
6 8 3 5
6 7 8 4
Hard #3
7
9 1 5 2 4 8
3 4 5
9 4 5 2 6
8 2
6 1
5 7 4 2
2 7 9
8 9 6
Hard #4
3 9 5
3 8 2
5 2 4
3 9 5 2 8
4 7 3
1 8 3
1 3
9 6 5 8
7 4 2
Hard #5
5 6 1 2 3 9
4 7 6 3
2 9 3 5
2
1 9 5 4
1 3 9
7 4 2 1
8 4 3
Hard #6
8 4 3
6 2
6 1 9 8 7
1 9 4
3 8 5 6
6 5 1
5 4 1 7
4 8 6 3
9
Hard #7
8 1 9
7 9 2
3 5 7 1
8 3 2
9 4 7 8 6
1 6 7
9 8 5
8 5
1 8 4
Hard #8
6 4 5
2
1 7 5 2 9 8
7 3 2
2 1 8 3
5 2 6 8
1 5 8 4
7
8 9 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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